Harmony & facial ratios
Ipsilateral Alar Angle
1 min read · Updated October 4, 2026
The angle at the base of the nose between lines running up to the outer corners of the eyes.
What it is
The ipsilateral alar angle (IAA) is a front-view angle that links the nose to the eyes. Its vertex is the base of the nose, and its arms run up to the outer end of each eye. It describes how wide the eyes sit as seen from the nose base.
How it's measured
The angle between the two lines from the nose-base point to the outer end of each upper-lid hood, calculated in a levelled frame.
How it's read
It is read alongside the jaw frontal angle rather than on its own: faces where the two angles are close read as harmoniously tapered from midface to jaw. The raw angle on its own is a descriptive number, not a quality in itself.
What affects it
Because it depends on the nose-base point and both eye ends, a tilted head or squinting eyes will move it. Keep your head level and eyes fully open.
Related measurements
In the same group: Nose Bridge to Nose Width and Intercanthal-Nasal Width Ratio. The full list is on the Harmony overview.
See it on a full report
Open the sample report to see every measurement, score and highlight on a real example.